1,1

For n>1, it appears that each prime is a cluster prime. See A038134.

Table of n, a(n) for n=1..12.

a(n)= A120934(n)+A008407(n)

Cf. A020497.

Sequence in context: A075620 A131525 A082751 * A015183 A163262 A132570

Adjacent sequences: A120932 A120933 A120934 * A120936 A120937 A120938

nonn

T. D. Noe, Jul 21 2006

a(12) from Donovan Johnson, Apr 18 2012

approved